Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fuel Injection System - Diesel: Testing: EGR
Proper EGR solenoid resistance is between 20-40 ohms. The solenoid operates on 12 volts, supplied by the ignition. The ground is completed by the ECM (Electronic Control Module) to turn the solenoid "ON", allowing vacuum to the EGR. The signal from the ECM is Pulse Width Modulated, which changes "ON" time from 0 to 100%.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.